Negative rigidity shock reduction and isolation device for continuous beam

Abstract

The invention relates to a negative rigidity shock reduction and isolation device for a continuous beam. The negative rigidity shock reduction and isolation device for the continuous beam comprises atrigger device, a sliding device, a buffer device, a fixed device, a positive rigidity spring group and a negative rigidity spring group. The top of the trigger device is fixedly connected with a lowwing plate of a main beam of the continuous beam, and the buffer device is fixedly arranged in the middle of the fixed device. The inner side of the sliding device is connected with the buffer devicethrough the negative rigidity spring group, the two sides of the sliding device are connected with the fixed device through the positive rigidity spring group, and the fixed device is fixed to the topof a movable pier. The negative rigidity shock reduction and isolation device for the continuous beam has simple principle and is economical and reliable, the movable pier and a fixed pier bear earthquake horizontal load cooperatively, the problem that the overall seism response of a continuous beam bridge is greatly increased due to the fact that the overall lateral displacement resistance rigidity of a continuous beam bridge is increased due to the intervention of an existing beam pier locking device is solved, and the negative rigidity shock reduction and isolation device for the continuous beam can be used for the seismic design of a newly-built continuous beam and the seismic reinforcement of an existing continuous beam bridge and is convenient to popularize and apply.

Description

technical field [0001] The invention relates to a negative-stiffness shock-reduction and isolation device for continuous beams, belonging to the technical field of bridge shock-reduction and isolation. Background technique [0002] In order to meet the displacement requirements caused by temperature load, creep, etc., each link of a continuous girder bridge is often provided with only one fixed pier, so that most of the longitudinal seismic load of the superstructure under earthquake action is borne by the fixed pier, and the fixed pier The seismic capacity of the continuous girder bridge is difficult to meet the seismic demand, and the longitudinal seismic displacement response of the continuous girder bridge is relatively large, which easily causes damage to expansion joints and supports. It is an effective method to reduce the seismic response of continuous beams by changing the single stress state of the fixed pier, giving full play to the seismic potential of the movabl...

AI Technical Summary

Problems solved by technology

But at present there are some problems in the connecting device that makes the movable pier and the beam body locked. Although existing devices such as Lock-up device and deadlock pin device can realize the locking function of the movable pier and the beam body, the activation of the locking device changes. The structural system of the continuous girder bridge is established, and the force transmission path is generated between the main girder and the movable pier, which increases the overall stiffness of the continuous girder bridge, resulting in a decrease in the seismic period of the entire bridge, which leads to an increase in the seismic response of the entire bridge

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